JPS63105082A - Adhesive for resin-impregnated wood - Google Patents

Abstract

PURPOSE:To obtain an adhesive for resin-impregnated wood, capable of preventing curing reaction of the oily resin during storage of the adhesive, etc., and useful for decorative laminated boards, e.g. strip flooring, etc., by containing a polymerizable oily resin, polymerization initiator and specific colorant in an aqueous adhesive. CONSTITUTION:An adhesive obtained by blending (A) an aqueous adhesive with (B) a polymerizable oily resin, e.g. unsaturated polyester, etc., (C) a polymerization initiator, e.g. hydrogen peroxide, etc., and (D) a colorant containing no metallic ion reactive with the component (C) or a colorant without direct contact with the component (C). The amount of the blended component (B) is preferably 5-40pts.wt. based on 100pts.wt., component (A).

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention relates to a resin-impregnated wood adhesive used for decorative laminates such as edge decks.

[Background technology]

Generally, in order to strengthen the surface of flooring materials such as edge decks, a resin impregnation treatment called WPC treatment is performed, in which the wood veneer on the surface is impregnated with a polymeric resin and hardened.

FIG. 1 shows a state in which a resin-impregnated wood veneer l treated with resin in this manner is adhered onto a base material 3 such as plywood via an adhesive 2. As shown in FIG. In this case, as the adhesive 2, an oil-based adhesive with a high non-volatile content is used. This is because with wood that has not been impregnated with resin, the wood itself allows some volatile matter to permeate even if you use a regular water-based adhesive or an oil-based adhesive with a high volatile content, whereas with resin-impregnated wood veneer l. This is because, as shown in FIG. 2, as there is no permeation of volatile components, there is no place for volatile components such as moisture and organic solvents to escape after bonding, causing the wood veneer 1 to swell, a so-called puncture phenomenon. be.

However, conventional bonding operations using oil-based adhesives with a high non-volatile content have had problems in that workability is poor and, therefore, the stability of adhesive strength is poor.

Therefore, it is recommended to mix an oil-based resin (adhesive) with a high non-volatile content into the water-based adhesive! It was done. This improves work efficiency and solves problems such as swelling of the lumber i11.

However, when a colorant is added to such a resin-impregnated wood adhesive, if the colorant is a powdered pigment containing metal ions, the metal ions decompose and activate the polymerization initiator, which is a peroxide. However, the curing reaction of the oil-based resin (such as unsaturated polyester) starts before the wood veneer is bonded, resulting in poor adhesion.

This phenomenon varies depending on the decomposition temperature of the peroxide, but becomes particularly noticeable when the ambient temperature exceeds 35°C.

[Purpose of the invention]

An object of this invention is to provide a resin-impregnated wood adhesive that prevents activation of the polymerization initiator prior to bonding.

[Disclosure of the Invention] The resin-impregnated wood adhesive of the present invention includes a water-based adhesive containing a polymerizable oil-based resin, a polymerization initiator that hardens the oil-based resin, and a metal ion that reacts with the polymerization initiator. It is characterized by the fact that it is mixed with a coloring agent.

As described above, according to the present invention, since the colorant does not contain metal ions that react with the polymerization initiator,
Even if this is added to the adhesive together with the polymerization initiator, the polymerization initiator will not be activated, and as a result, the curing reaction of the oil-based resin will be prevented from starting during storage of the adhesive. can.

In addition, another resin-impregnated wood adhesive of the present invention includes a water-based adhesive, a polymerizable oil-based resin, a polymerization initiator that hardens the oil (L), and a coloring agent that does not come into direct contact with the polymerization initiator. It is characterized by being mixed with the agent.

In this invention, since the colorant does not come into direct contact with the polymerization initiator, the polymerization initiator is not activated in the same manner as described above, and as a result, the curing reaction of the oil-based resin is initiated during storage of the adhesive. can be prevented.

The water-based adhesive is used to improve the workability of bonding work, and may be an emulsion type conventionally used for bonding wood, such as a water-based vinyl urethane type, a vinyl acetate resin emulsion type, or polyvinyl alcohol. water? Any 8-component water-based adhesive can be used.

As the oil-based resin, for example, prepolymers such as unsaturated polyester, monomers such as styrene, methyl methacrylate, etc. can be used. Further, examples of the polymerization initiator include hydrogen peroxide, benzoyl peroxide, cumene peroxide, di-t-butyl peroxide, and the like.

By mixing an oil-based resin with the water-based adhesive, when the resin-impregnated wood is bonded to a surface such as plywood with this adhesive, the moisture that evaporates from the water-based adhesive is absorbed between the resin-impregnated wood and the surface to be bonded. Problems such as resin-impregnated wood swelling due to escape from the gap can be solved. The reasons for this are not clear, but firstly, adding an oil-based resin to a water-based adhesive reduces the absolute amount of volatile matter, and secondly, water-based adhesives and oil-based resins are poorly compatible. It is presumed that this makes it easier for moisture, which is a volatile component, to escape from between the resin-impregnated wood and the surface to be bonded.

The amount of such oil-based resin added to the water-based adhesive is 1
It is preferably 5 to 100 parts, especially 5 to 40 parts, based on 0.00 parts by weight (the same applies hereinafter). If the amount of oil-based resin added is greater than the above range, the adhesive performance will significantly deteriorate, making it difficult to work. As the properties deteriorate, the resin's ffflI
Depending on the JI, phase separation may occur. Furthermore, if the amount of the oil-based resin added is smaller than the above range, there is a risk that the resin-impregnated wood may swell due to the explosion of water from the water-based adhesive.

The coloring agent is a coloring agent (dye or pigment) that does not contain metal ions that react with the polymerization initiator or does not come into direct contact with the polymerization initiator. Examples of colorants that do not come into direct contact with the polymerization initiator include emulsion-type colorants,
Examples include aqueous colorants coated with surfactants.

The reason why a coloring agent is added to the adhesive for bonding the resin-impregnated wood veneer to the base material is to make the wood grain of the resin-impregnated water t41 temporary wood grain clear. In other words, when a wood veneer is impregnated with resin and cured, the permeability of the wood veneer improves, but as shown in FIG. As a result, the resin is filled with more resin than the wood part 6 (end), which has a higher density, and the permeability becomes higher. When the color of the wood veneer 4 is viewed, the appearance of the spring wood and summer wood on the wood structure is reversed, and they appear as summer wood and spring wood, respectively. This makes the wood grain of the board clearer.

As the resin to be impregnated into the wood veneer, the same oil-based resin as mentioned above can be used. In this case, it is preferable to add rosin to the impregnating resin in advance, and this makes it possible to express the wood grain of a ground pine pattern, which was difficult to achieve with colored adhesives alone.

The type of rosin (molecular formula, molecular weight, etc.) to be selected can be determined as appropriate based on the relationship with the four tube diameters of the material used. In addition, the rosin to be added is resin 100
It is appropriate that the amount is 30 parts by weight or less based on fflffi parts.

This rosin, together with the impregnating resin, is impregnated in a larger amount in the spring wood part of the wood veneer than in the summer wood part, which has the advantage of increasing the gloss of the summer wood part (wood grain) in appearance and giving the impression of pine tar. .

Next, the resin-impregnated wood adhesive of the present invention will be explained with reference to Examples.

Example: Thickness Q, rice sliced into 5 sm) 1"
The veneer was impregnated with resin according to a conventional method, and then the resin-impregnated wood veneer was laminated on a plywood coated with a colored adhesive having the composition shown below and bonded together by pressure.

(Components) (Parts) Water-based vinyl urethane 100 Unsaturated polyester 301!2 Covering pigment
3 Water-based colorant 1
Peroxide 0.6 The prepared adhesive has a pot life of only 5 to 6 minutes when the ambient temperature exceeds 35°C with conventional powder pigments.
It lasted for 10 minutes or more, and the pre-curing phenomenon of the adhesive could be prevented.

In addition, 10 of the decorative boards for the edge deck created in this way
As for No. 0, the phenomenon of blistering of the veneer on the surface was visually inspected, but there was no blistering of the veneer at all. Additionally, the adhesive that adhered to the coating roll can be washed off with water, greatly improving workability.

〔Effect of the invention〕

According to this invention, since the colorant does not contain metal ions that react with the polymerization initiator or does not come into direct contact with the polymerization initiator, it can be added to the adhesive together with the polymerization initiator. Also, the polymerization initiator is not activated, and as a result, it is possible to prevent the curing reaction of the oil-based resin from starting during storage of the adhesive.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state of adhesion of a resin-impregnated wood veneer onto a base material, Figure 2 is an explanatory diagram showing the blistering phenomenon of a resin-impregnated wood veneer, and Figure 3 is an explanatory diagram showing an outline of the wood structure. It is a diagram. ■... Resin-impregnated wood veneer, 2... Adhesive, 3...
Convex material Fig. 1 Fig. 2 Fig. 3

Claims (2)

[Claims] (1) A resin characterized by mixing a water-based adhesive with a polymerizable oil-based resin, a polymerization initiator that hardens the oil-based resin, and a colorant that does not contain metal ions and reacts with the polymerization initiator. Impregnated wood adhesive. (2) An adhesive for resin-impregnated wood characterized by mixing a water-based adhesive with a polymerizable oil-based resin, a polymerization initiator that hardens the oil-based resin, and a coloring agent that does not come into direct contact with the polymerization initiator. agent.